If you don't have room, I'd probably post an add looking for someone knowledgable to take him/her. Mollies produce tons of ammonia and that poor thing has probably been seriously affected by this. Let her heal some more and rehome her.

AWW! Poor thing... SHAME on that woman! Definitely looks like a molly to me. I don't know much yet, but I love my little mollies! I actually have a couple of dalmatians and they look quite a bit like that little guy (though agree with the others that yours is super thin). Mollies are tough little critters! S/he WILL need a bigger space than a betta, yes (they have a higher bioload than many fish), but before you decide to toss him into a pond look closely at what's left of his topfin, and compare it with some images online. There are several different types of mollies that can carry the 'dalmatian' coloring, and the Sailfin mollies are the largest. Some types only get to be around 3 inches. Still a big fish, yes, but not pond material! Also. . . a lot depends on his personality. MY mollies are NOT aggressive AT ALL and have been just fine in a community tank with various room-mates, including guppies, goldfish, pleco, neon tetras, apple snails, and an African dwarf frog, so once you're sure that he's disease-free, you might want to give it a try with some beta room-mates adn see how it goes! Also, and I *might* be wrong about this, but I don't think that Mollies are schooling fish. I think they do fine on their own, but are more playful in company. Again, new at this and might be wrong. . . I AM sure that if you had more than one sex you'd have to keep the 2/3 female for every 1 male ratio. I really hope you find a way to take care of this poor little fish, and that he makes it through this ordeal. Mollies are charming little fish. . . What a wretched woman! Ug! Good luck!

6" Holy Moly ! You must of had a monster Molly !!! I wouldntt recommend putting a 6" fish into a 20 gallon tank IMO

I never owned one that big mine was only 3ish from head to tail. In rare cases they do go to six inches and shockingly enough, most people recommend 20 gallons at minimum for I think three. I have seen some as big as 6 inches at Jack's Aquarium they were awesome.

AWW! Poor thing... SHAME on that woman! Definitely looks like a molly to me. I don't know much yet, but I love my little mollies! I actually have a couple of dalmatians and they look quite a bit like that little guy (though agree with the others that yours is super thin). Mollies are tough little critters! S/he WILL need a bigger space than a betta, yes (they have a higher bioload than many fish), but before you decide to toss him into a pond look closely at what's left of his topfin, and compare it with some images online. There are several different types of mollies that can carry the 'dalmatian' coloring, and the Sailfin mollies are the largest. Some types only get to be around 3 inches. Still a big fish, yes, but not pond material! Also. . . a lot depends on his personality. MY mollies are NOT aggressive AT ALL and have been just fine in a community tank with various room-mates, including guppies, goldfish, pleco, neon tetras, apple snails, and an African dwarf frog, so once you're sure that he's disease-free, you might want to give it a try with some beta room-mates adn see how it goes! Also, and I *might* be wrong about this, but I don't think that Mollies are schooling fish. I think they do fine on their own, but are more playful in company. Again, new at this and might be wrong. . . I AM sure that if you had more than one sex you'd have to keep the 2/3 female for every 1 male ratio. I really hope you find a way to take care of this poor little fish, and that he makes it through this ordeal. Mollies are charming little fish. . . What a wretched woman! Ug! Good luck!

I did a little research about the hole schooling thing after reading this and I tend to like your opinion. There are many differing opinions on molly's. Some say they are schooling fish and some say they are shoaling fish (like thier kind for social reasons only) I don't know though. My molly's are around each other a lot and rarely let eachother out of sight. I guess on schooling or shoaling or a loner fish you have to base it off of experience and what you believe. Great information.